I have been struggling to learn how to do this. Given 2H2+ Oz--> 2H20 What mass of oxygen is needed to produce 29 moles of water

Answer 1

First, let's write the correctly balanced equation:

2H₂(g) + O₂(g) ==> 2H₂O(g) ... balanced equation

Use the mole ratio of O₂ and H₂O in the balanced equation, and the molar mass of O₂ (32 g/mol)

29 moles of H₂O x 1 mole O₂ / 2 moles H₂O x 32 g O₂ / mol O₂ = 464 g O₂ = 460 g O₂ (2 sig.figs.)